{
  "manageEntity": {
    "action": "Save",
    "entityId": "812742138",
    "entityType": "Track",
    "nonce": "0x4400065be1a36e6b67a001cbee734dff06838f60587c5b177929af1d8ed4a5f2",
    "signature": "0xd4d7ece74e318756c3ce82f2886cf38325c4677b29aabaaac987536254ad939d7f6f48b4db3e3df2151606708f25aa8dc8c0a9f0327abb8eb5add71ea28bbf601c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}